import { NextRequest, NextResponse } from 'next/server'
import type { ExtractedError, ErrorCategory, LogExtractionResponse } from '@/types/infrastructure-modules'

// Woodpecker API configuration
const WOODPECKER_URL = process.env.WOODPECKER_URL || 'http://woodpecker-server:8000'
const WOODPECKER_TOKEN = process.env.WOODPECKER_TOKEN || ''

// =============================================================================
// Error Pattern Matching
// =============================================================================

interface ErrorPattern {
  pattern: RegExp
  category: ErrorCategory
  extractMessage?: (match: RegExpMatchArray, line: string) => string
}

/**
 * Patterns fuer verschiedene Fehlertypen in CI/CD Logs
 */
const ERROR_PATTERNS: ErrorPattern[] = [
  // Test Failures
  {
    pattern: /^(FAIL|FAILED|ERROR):?\s+(.+)$/i,
    category: 'test_failure',
    extractMessage: (match, line) => match[2] || line,
  },
  {
    pattern: /^---\s+FAIL:\s+(.+)\s+\([\d.]+s\)$/,
    category: 'test_failure',
    extractMessage: (match) => `Test failed: ${match[1]}`,
  },
  {
    pattern: /pytest.*FAILED\s+(.+)$/,
    category: 'test_failure',
    extractMessage: (match) => `pytest: ${match[1]}`,
  },
  {
    pattern: /AssertionError:\s+(.+)$/,
    category: 'test_failure',
    extractMessage: (match) => `Assertion failed: ${match[1]}`,
  },
  {
    pattern: /FAIL\s+[\w\/]+\s+\[build failed\]/,
    category: 'build_error',
  },

  // Build Errors
  {
    pattern: /^(error|Error)\[[\w-]+\]:\s+(.+)$/,
    category: 'build_error',
    extractMessage: (match) => match[2],
  },
  {
    pattern: /cannot find (module|package)\s+["'](.+)["']/i,
    category: 'build_error',
    extractMessage: (match) => `Missing ${match[1]}: ${match[2]}`,
  },
  {
    pattern: /undefined:\s+(.+)$/,
    category: 'build_error',
    extractMessage: (match) => `Undefined: ${match[1]}`,
  },
  {
    pattern: /compilation failed/i,
    category: 'build_error',
  },
  {
    pattern: /npm ERR!\s+(.+)$/,
    category: 'build_error',
    extractMessage: (match) => `npm error: ${match[1]}`,
  },
  {
    pattern: /go:\s+(.+):\s+(.+)$/,
    category: 'build_error',
    extractMessage: (match) => `Go: ${match[1]}: ${match[2]}`,
  },

  // Security Warnings
  {
    pattern: /\[CRITICAL\]\s+(.+)$/i,
    category: 'security_warning',
    extractMessage: (match) => `Critical: ${match[1]}`,
  },
  {
    pattern: /\[HIGH\]\s+(.+)$/i,
    category: 'security_warning',
    extractMessage: (match) => `High severity: ${match[1]}`,
  },
  {
    pattern: /CVE-\d{4}-\d+/,
    category: 'security_warning',
    extractMessage: (match, line) => line.trim(),
  },
  {
    pattern: /vulnerability found/i,
    category: 'security_warning',
  },
  {
    pattern: /secret.*detected/i,
    category: 'security_warning',
  },
  {
    pattern: /gitleaks.*found/i,
    category: 'security_warning',
  },
  {
    pattern: /semgrep.*finding/i,
    category: 'security_warning',
  },

  // License Violations
  {
    pattern: /license.*violation/i,
    category: 'license_violation',
  },
  {
    pattern: /incompatible license/i,
    category: 'license_violation',
  },
  {
    pattern: /AGPL|GPL-3|SSPL/,
    category: 'license_violation',
    extractMessage: (match, line) => `Potentially problematic license found: ${match[0]}`,
  },

  // Dependency Issues
  {
    pattern: /dependency.*not found/i,
    category: 'dependency_issue',
  },
  {
    pattern: /outdated.*dependency/i,
    category: 'dependency_issue',
  },
  {
    pattern: /version conflict/i,
    category: 'dependency_issue',
  },
]

/**
 * Patterns to extract file paths from error lines
 */
const FILE_PATH_PATTERNS = [
  /([\/\w.-]+\.(go|py|ts|tsx|js|jsx|rs)):(\d+)/,
  /File "([^"]+)", line (\d+)/,
  /at ([\/\w.-]+):(\d+):\d+/,
]

/**
 * Patterns to extract service names from log lines or paths
 */
const SERVICE_PATTERNS = [
  /service[s]?\/([a-z-]+)/i,
  /\/([a-z-]+-service)\//i,
  /^([a-z-]+):\s/,
]

// =============================================================================
// Log Parsing Functions
// =============================================================================

interface LogLine {
  pos: number
  out: string
  time: number
}

function extractFilePath(line: string): { path?: string; lineNumber?: number } {
  for (const pattern of FILE_PATH_PATTERNS) {
    const match = line.match(pattern)
    if (match) {
      return {
        path: match[1],
        lineNumber: parseInt(match[2] || match[3], 10) || undefined,
      }
    }
  }
  return {}
}

function extractService(line: string, filePath?: string): string | undefined {
  // First try to extract from file path
  if (filePath) {
    for (const pattern of SERVICE_PATTERNS) {
      const match = filePath.match(pattern)
      if (match) return match[1]
    }
  }

  // Then try from the line itself
  for (const pattern of SERVICE_PATTERNS) {
    const match = line.match(pattern)
    if (match) return match[1]
  }

  return undefined
}

function parseLogLines(logs: LogLine[], stepName: string): ExtractedError[] {
  const errors: ExtractedError[] = []
  const seenMessages = new Set<string>()

  for (const logLine of logs) {
    const line = logLine.out.trim()
    if (!line) continue

    for (const errorPattern of ERROR_PATTERNS) {
      const match = line.match(errorPattern.pattern)
      if (match) {
        const message = errorPattern.extractMessage
          ? errorPattern.extractMessage(match, line)
          : line

        // Deduplicate similar errors
        const messageKey = `${errorPattern.category}:${message.substring(0, 100)}`
        if (seenMessages.has(messageKey)) continue
        seenMessages.add(messageKey)

        const fileInfo = extractFilePath(line)
        const service = extractService(line, fileInfo.path)

        errors.push({
          step: stepName,
          line: logLine.pos,
          message,
          category: errorPattern.category,
          file_path: fileInfo.path,
          service,
        })

        break // Only match first pattern per line
      }
    }
  }

  return errors
}

// =============================================================================
// API Handler
// =============================================================================

/**
 * POST /api/infrastructure/logs/extract
 *
 * Extrahiert Fehler aus Woodpecker Pipeline Logs.
 *
 * Request Body:
 * - pipeline_number: number (required)
 * - repo_id?: string (default: '1')
 *
 * Response:
 * - errors: ExtractedError[]
 * - pipeline_number: number
 * - extracted_at: string
 * - lines_parsed: number
 */
export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { pipeline_number, repo_id = '1' } = body

    if (!pipeline_number) {
      return NextResponse.json(
        { error: 'pipeline_number ist erforderlich' },
        { status: 400 }
      )
    }

    // 1. Fetch pipeline details to get step IDs
    const pipelineResponse = await fetch(
      `${WOODPECKER_URL}/api/repos/${repo_id}/pipelines/${pipeline_number}`,
      {
        headers: {
          'Authorization': `Bearer ${WOODPECKER_TOKEN}`,
          'Content-Type': 'application/json',
        },
        cache: 'no-store',
      }
    )

    if (!pipelineResponse.ok) {
      return NextResponse.json(
        { error: `Pipeline ${pipeline_number} nicht gefunden` },
        { status: 404 }
      )
    }

    const pipeline = await pipelineResponse.json()

    // 2. Extract step IDs from workflows
    const failedSteps: { id: number; name: string }[] = []

    if (pipeline.workflows) {
      for (const workflow of pipeline.workflows) {
        if (workflow.children) {
          for (const child of workflow.children) {
            if (child.state === 'failure' || child.state === 'error') {
              failedSteps.push({
                id: child.id,
                name: child.name,
              })
            }
          }
        }
      }
    }

    // 3. Fetch logs for each failed step
    const allErrors: ExtractedError[] = []
    let totalLinesParsed = 0

    for (const step of failedSteps) {
      try {
        const logsResponse = await fetch(
          `${WOODPECKER_URL}/api/repos/${repo_id}/pipelines/${pipeline_number}/logs/${step.id}`,
          {
            headers: {
              'Authorization': `Bearer ${WOODPECKER_TOKEN}`,
              'Content-Type': 'application/json',
            },
          }
        )

        if (logsResponse.ok) {
          const logs: LogLine[] = await logsResponse.json()
          totalLinesParsed += logs.length

          const stepErrors = parseLogLines(logs, step.name)
          allErrors.push(...stepErrors)
        }
      } catch (logError) {
        console.error(`Failed to fetch logs for step ${step.name}:`, logError)
      }
    }

    // 4. Sort errors by severity (security > license > build > test > dependency)
    const categoryPriority: Record<ErrorCategory, number> = {
      'security_warning': 1,
      'license_violation': 2,
      'build_error': 3,
      'test_failure': 4,
      'dependency_issue': 5,
    }

    allErrors.sort((a, b) => categoryPriority[a.category] - categoryPriority[b.category])

    const response: LogExtractionResponse = {
      errors: allErrors,
      pipeline_number,
      extracted_at: new Date().toISOString(),
      lines_parsed: totalLinesParsed,
    }

    return NextResponse.json(response)

  } catch (error) {
    console.error('Log extraction error:', error)
    return NextResponse.json(
      { error: 'Fehler bei der Log-Extraktion' },
      { status: 500 }
    )
  }
}

/**
 * GET /api/infrastructure/logs/extract?pipeline_number=123
 *
 * Convenience method - calls POST internally
 */
export async function GET(request: NextRequest) {
  const searchParams = request.nextUrl.searchParams
  const pipeline_number = searchParams.get('pipeline_number')
  const repo_id = searchParams.get('repo_id') || '1'

  if (!pipeline_number) {
    return NextResponse.json(
      { error: 'pipeline_number Query-Parameter ist erforderlich' },
      { status: 400 }
    )
  }

  // Create a mock request with JSON body
  const mockRequest = new NextRequest(request.url, {
    method: 'POST',
    body: JSON.stringify({ pipeline_number: parseInt(pipeline_number, 10), repo_id }),
    headers: {
      'Content-Type': 'application/json',
    },
  })

  return POST(mockRequest)
}